25 terms

# Chapter 2- Physics

Newton's Laws of Motion
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whirl a rock at the end of a string and it follows a circular path. If the string breaks, the rock tends to
follow a straight - line path
a sheet of paper can be pulled from beneath a box of cereal without toppling it if the paper is jerked quickly. This is best demonstrates that
the box has inertia
a hockey puck slides across a frozen pond. If ice friction and air resistance are neglected, the force needed to keep the puck sliding at constant velocity is
0 N
earth moves about 30 km/s relative to the sun. when you jump upward in front of a wall, the wall doesn't slam into you at 30 km/s because the wall
and you move at the same horizontal speed, before, during, and after your jump
a roller coaster car at an amusement park carrying 1 passenger takes 3 min to make its ride from start to finish. Neglecting friction, a car with 5 passengers would take
the same time
to steadily (constantly) increase the velocity of something requires a
constant force
a given net force propels an object along a straight-line path. if the net force were doubled, its acceleration would
double
a push on a 1 kg brick accelerates the brick. neglecting friction, to equally accelerate a 10 kg brick requires the force to be
10 times as much
a car has a mass of 1000 kg and accelerates at 2 m/s^2. what is the magnitude of the force exerted on the car?
2000 N
a girl pulls on a 10 kg wagon with a constant force of 30 N. what is the wagon's acceleration?
3.0 m/s^2
A commercial jet has a mass of 5,000 kg and the thrust of its engine is 10,000 N. the acceleration of the jet when taking off is
2 m/s^2
A 10 kg block is pushed across a horizontal surface with a horizontal force of 30 N against a friction force of 10 N. the acceleration of the block is
2 m/s^2
a 10 kg brick and a 1 kg book are are dropped in a vacuum. the force of gravity on the 10 kg brick is
10 times as much as the force on the 1 kg book
when you toss a coin straight up, it moves upward, turns around, an drops. during this time the acceleration of the coin is
downward and constant
a 10 N falling object encounters 4 N of air resistance. the net force on it is
6 N
drop a rock from a 5 m height and it accelerates at 10 m/s^2 and strikes the ground in
1 s
when a skydiver of mass 100 kg experiences air resistance of 400 N, her acceleration is
0.6 g
a light woman and a heavy man jump from an airplane at the same time and open their same size parachutes at the same time. which person will get to a state of zero acceleration first?
the light woman
when a 500 N parachutist opens his chute and experiences 800 N of air resistance, the net force on him is
300 N upward
Action and reaction forces comprise the parts of
a single interaction
when a baseball player hits a ball with a force of 1000 N, the ball exerts force on the bat of
1000 N
an archer shoots an arrow. if the action force is the bowstring on the arrow, the reaction is the
arrow's push on the bowstring
as a ball falls, the action force is the pull of Earth's mass on the ball. the reaction force is the
pull of the ball's mass on Earth
a Mack truck and a Mini Cooper traveling at the same speed collide head on. the collision force is greatest on
the same for both
arnold strongman and suzie small have a tug of war on a polished floor. arnold wears socks and suzie wears gym shoes. the likely winner is
Suzie